Which Legacy Technologies Will Still Power the World in 2100?

COBOL

COBOL, first released in 1960, has reached a 66‑year lifespan and remains the primary language for core banking systems, ATM networks, credit‑card clearing, and large‑scale batch processing on mainframes. Major commercial banks, payment networks, securities exchanges, and government inventory systems still run critical account‑processing workloads on IBM Z series (e.g., IBM z17) using COBOL. The language’s latest standard, COBOL 2023, adds modern data‑type support and JSON handling, but the runtime environment is still the same high‑reliability mainframe architecture that has existed since the IBM 701.

C

C continues to dominate system‑level programming after more than five decades because it compiles to efficient native code on virtually any CPU architecture. Its performance is unmatched for low‑level tasks, and it is the lingua franca for operating‑system kernels, embedded firmware, and performance‑critical libraries such as FFmpeg. Although C’s lack of built‑in memory safety introduces security risks, its portability and mature tooling (gcc, clang, make) keep it indispensable.

Rust

Rust is increasingly adopted as a memory‑safe alternative for system code. The language is now considered mature for contributions to the Linux kernel, with several subsystems (e.g., drivers, networking stacks) being rewritten in Rust. Rust’s ownership model eliminates data races and buffer overflows, while its zero‑cost abstractions preserve performance comparable to C. The trade‑off is a steeper learning curve and longer compile times.

SQL

SQL remains the universal query language embedded in all major relational database management systems (Oracle, PostgreSQL, MySQL, Microsoft SQL Server, DB2). Enterprise workloads routinely execute queries over billions of rows, and stored procedures encapsulate business logic directly in the database layer. Because relational algebra underpins data integrity and transactional guarantees, SQL is unlikely to be replaced in the foreseeable future.

JavaScript / TypeScript

JavaScript is the de‑facto language of web browsers, and TypeScript adds static typing while compiling to JavaScript. Both are the foundation of client‑side interactivity and server‑side runtimes such as Node.js. As long as the Web platform persists, compatibility with existing JavaScript codebases and the extensive ecosystem of npm packages ensure their continued relevance.

Linux and Core Tooling

The Linux kernel, first released in 1991, is projected to remain the dominant operating system kernel well beyond 2100. Its open‑source development model, broad hardware support, and extensive driver ecosystem make it the default for servers, desktops, embedded devices, and cloud infrastructure. Complementary tools—Git (version control), vi and Emacs (text editors), and Bash (shell)—have been part of the Unix philosophy for decades and are expected to stay in active use for at least another century.

Kubernetes

Kubernetes has become the standard container orchestrator across public and private clouds. It abstracts compute, storage, and networking resources, providing declarative APIs for scaling and self‑healing workloads. Despite criticisms about complexity, its role as the foundation of cloud‑native architectures (service meshes, CI/CD pipelines, serverless platforms) makes it a long‑term fixture.

Graphics Editing Software

Adobe Photoshop, together with the open‑source alternative GIMP, dominates professional image‑editing workflows. Photoshop’s extensive plugin ecosystem, RAW processing capabilities, and industry‑standard file formats (PSD, TIFF) ensure its adoption in photography, design, and media production for decades to come.